document.write( "Question 1055238: Nicolas mixes three solutions of acid with concentrations of 10%, 15%, and 5%. He wants to make 30 L of a mixture that is 12% acid and he uses four times as much of the 15% solution as the 5% solution. How much each of the three solutions must he use? \n" ); document.write( "

Algebra.Com's Answer #670449 by josgarithmetic(39620) $\"\"$ $\"About$

You can put this solution on YOUR website!
Three-part mixture but you can turn this into something that looks like a two-part mixture problem.\r
\n" ); document.write( "\n" ); document.write( "

\r\n" );
document.write( "VOLUME     CONCENTRATION\r\n" );
document.write( "x            5%\r\n" );
document.write( "y           10%\r\n" );
document.write( "z           15%\r\n" );
document.write( "\r\n" );
document.write( "\r\n" );
document.write( "

\n" ); document.write( "Already an equation is identified.\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( " $\"system%28%285x%2B10y%2B15z%29%2F30=12%2Cx%2By%2Bz=30%29\"$
\n" ); document.write( "and again, you know one already found equation, useful as $\"z=4x\"$ .\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( " $\"system%28%285x%2B10y%2B15%284x%29%29%2F30=12%2Cx%2By%2B4x=30%29\"$ \r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( " $\"system%2865x%2B10y=360%2C5x%2By=30%29\"$ \r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( " $\"system%2812x%2B2y=72%2C5x%2By=30%29\"$
\n" ); document.write( "If you think carefully for a few seconds, you can continue this partly through Elimination Method.\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "( x=6 ) \n" ); document.write( "

\n" );